Huh!! How strange... well don't I feel foolish! It's working fine with a revised album ID, thanks for the help Brandon.

Whilst I'm here, can you tell me any reason as to why the fluidThumbs='true' reference wouldn't work? As you will see in the code (in the post above) I've included it, but the output still defines the thumbs as having a fixed width of 121px. Ideally I would like to create a custom gallery so that it uses the classes for the layout grid I am using (Zurb's Foundation v4).